The Vasyugan Swamp (Russian: Васюганские болота) is the largest swamp in the northern hemisphere as well as the largest peatland in the world. It is located in Russia, in southwestern Siberia. The swamp is a major reservoir of fresh water for the region, and the Vasyugan river has its source there. It is home to a number of endangered species which is a concern among local environmentalists as the production of oil and gas has become a major industry in the region.